Epilepsy and fits are not the same thing, though the terms are closely related. A “fit” is an informal word for a seizure, which is a single event caused by a sudden burst of abnormal electrical activity in the brain. Epilepsy is a chronic condition defined by a tendency to have repeated, unprovoked seizures. In other words, a fit is something that happens once; epilepsy is the underlying condition that makes it keep happening.
What “Fit” Actually Means in Medical Terms
“Fit” is a colloquial term, not a clinical one. In medical practice, the correct word is “seizure.” A convulsion, which involves muscles contracting repeatedly and sometimes loss of consciousness, is one type of seizure, but not all seizures look like that. Some seizures cause a person to stare blankly, feel confused, or experience unusual sensations without any visible shaking at all. The symptoms of these subtler seizures can be easily confused with other conditions entirely.
During any seizure, neurons in the brain fire signals simultaneously and much faster than normal. This electrical storm can affect a small area of the brain (a focal seizure) or spread across both sides (a generalized seizure). What the person experiences depends on where in the brain the abnormal firing occurs.
When a Seizure Becomes Epilepsy
A single seizure does not mean a person has epilepsy. Many people have one seizure in their lifetime and never have another. Epilepsy is typically diagnosed when someone has had at least two unprovoked seizures, meaning there was no obvious external trigger like a head injury, infection, or low blood sugar.
The distinction between “provoked” and “unprovoked” is important. Provoked seizures have a clear, identifiable cause: alcohol withdrawal, a severe drop in blood sugar, high fever, sleep deprivation, a reaction to medication, or a brain injury. Once that trigger is treated or removed, the seizures often stop. These are not epilepsy. Unprovoked seizures happen without any identifiable external cause, suggesting the brain itself has developed a tendency to produce them.
After a first unprovoked seizure in childhood, about 42% of children go on to have a second seizure within eight years. But children with a normal brain-wave test (EEG) whose first seizure happened while they were awake have a much lower recurrence risk, around 21% over five years. So even after an unprovoked seizure, the odds are not certain that epilepsy will follow.
Febrile Seizures in Children
Febrile seizures, or fits triggered by a high fever, are one of the most common reasons parents worry about epilepsy. These occur in young children, typically between six months and five years old, and can look alarming. But they are provoked seizures, caused by the fever itself, not by an underlying brain condition.
The vast majority of children who have febrile seizures never develop epilepsy. A large Korean registry study that followed more than 130,000 children for a median of nearly 12 years found that only 2.3% were later diagnosed with epilepsy. The broader medical estimate puts the range at 2% to 7%, depending on the child’s age and other risk factors. For most families, a febrile seizure is a one-time or occasional event that children outgrow.
Seizures That Aren’t Electrical at All
Some events that look exactly like seizures have no abnormal electrical activity in the brain. These are called psychogenic non-epileptic seizures, and they are real medical events, not faking. They are thought to be the body’s physical response to psychological stress or trauma, and they require their own form of treatment, usually psychological therapy rather than seizure medication.
Certain physical signs can help specialists tell these apart from epileptic seizures. Forceful eye closure during the event, eyes being closed for more than 55% of the seizure’s duration, and asynchronous limb movements (arms and legs jerking out of sync with each other) are all more commonly seen in non-epileptic seizures. Epileptic seizures, by contrast, more often involve the eyes being open or widened at onset and the head turning forcefully to one side. Non-epileptic events also tend to last longer, often beyond five minutes, while most epileptic seizures are shorter. No single sign is definitive on its own, though, and distinguishing the two usually requires monitoring in a hospital with video and brain-wave recording happening simultaneously.
How Epilepsy Is Diagnosed
After a seizure, doctors use several tools to determine whether it was a one-time event, a provoked seizure, or the beginning of epilepsy. The process starts with a detailed medical history: what happened before, during, and after the event, whether there were any possible triggers, and whether anything similar has happened before.
An EEG is usually the first test. Electrodes placed on the scalp measure electrical activity in the brain and can reveal abnormal patterns between seizures. A routine EEG takes minutes to a couple of hours. If results are normal but epilepsy is still suspected, a prolonged EEG with video monitoring over several days in a hospital can capture what happens during an actual seizure.
Brain imaging, most commonly an MRI, provides detailed structural pictures that can reveal lesions, scarring, or developmental abnormalities that might be causing seizures. More specialized scans like PET or SPECT can show changes in brain metabolism or blood flow, helping pinpoint exactly where seizures originate. Together, these tests build a picture of whether the brain has a persistent tendency to seize and, if so, where and why.
What to Do if You Witness a Seizure
Whether someone is having a seizure from epilepsy, a fever, or any other cause, the immediate response is the same. Stay calm and stay with them. Move anything nearby that could injure them. If they’re on the ground, gently roll them onto their side with their mouth pointing downward to keep the airway clear. Place something soft under their head, remove their glasses, and loosen anything tight around the neck.
Time the seizure. If it lasts longer than five minutes, call emergency services. Once the seizure ends, help them sit somewhere safe, let them know what happened, and offer to call someone who can help them get home. Do not hold them down, put anything in their mouth, or try to give them food or water until they are fully alert.